I just don't see how replacing Zubrus with Ruutu on that line is more effective. Granted Zubrus has played 6 more games but Zube's S% is 3 points higher, he has 14 more shots and 7 more points. It's kind of a wash IMO.
Ruutu is a career near 13% shooter, he is a better shooter than Zubrus regardless of the poor luck this season. Also, Ruutu is playing with inferior linemates. If you replace Zubrus with Ruutu, he is probably near 2 shots a game.